CN101004326A

CN101004326A - Continuous sintering oven

Info

Publication number: CN101004326A
Application number: CN 200710001379
Authority: CN
Inventors: 真锅弘幸
Original assignee: NGK Insulators Ltd
Current assignee: NGK Insulators Ltd
Priority date: 2006-01-12
Filing date: 2007-01-11
Publication date: 2007-07-25
Also published as: JP2007187374A; JP4522368B2

Abstract

The present invention provides a continual sintering furnace which is capable of discharging quickly bad gas generated in sintered matter out of the furnace even in a high temperature domain, wherein there are not needed much room and accessory equipments outside the furnace. At furnace chamber (1) inner side walls for feeding multi-layer cumulate sintered matter (W), a plurality of gas jetting-into nozzles (4) are set at a height level to sintered matter (W). At furnace wall inner part at outer side of each gas jetting-into nozzle (4), it is perfect to embed a gas warm-up chamber (5) equipped with a heater (9) along the jetting-into gas flowing path composed of double-layer porcelain tubes. The gas, such as nitrogen, supplied from outside is heated to in-furnance temperature and jetted into the furnace chamber (1) during it passes through the heater (9), and the bad gas generated in sintered matter (W) is discharged outside the furnance from vents (12).

Description

Continuous fritting furnace

Technical field

The present invention relates to have and be used for to spray into the continuous fritting furnace of nozzle at the gas that sintering is removed from the pernicious gas that is sintered product and produces.

Background technology

When sintering electronic unit and various ceramic, be extensive use of car tunnel furnace and the such continuous fritting furnace of platen pusher type furnace all the time.At the product that will be sintered in the furnace chamber delivered inside, according to fixed heating curves heat, sintering.

But,, in sintering, produce pernicious gas sometimes according to the kind that is sintered product.In certain ceramic sintering circuit, produce oxidizing gas along with sintering reaction at 1000～1100 ℃ temperature fields.And in the sintering of most potteries, the low temperature region about 300 ℃ produces binder gases.Because these gases produce harmful effect to the sintering quality when former state ground is stranded in the stove, so expect to be discharged to outside the stove as far as possible apace.

So, in the ceramic post sintering stove of majority, adopt by circulating fan from furnace chamber inner attract binder gases in, spray into the structure that the environmental gas of equivalent is discharged binder gases.But, use the structure of this type of circulating fan only can adopt at low temperature region, and in the use difficulty of the high temperature territory metal material more than 1000 ℃, so can not adopt looping construct.Have again,, use difficulty in the high temperature territory more than 1000 ℃ though in patent documentation 1 (spy opens flat 6-94369), disclose the furnace inner environment gas that will contain the binder gases about 500 ℃ system in the stove outer circulation.

Therefore,, must adopt hot-blast stove is set outside stove, and hot blast is sprayed in the stove to come and the furnace gas method of replacement in stove, exhaling pernicious gases in the high temperature territory more than 1000 ℃.But, in the method, because hot-blast stove must be set, and guide hot blast outside stove, so exist device structure to complicate and need the problem of exceptional space with pipeline.And, for eliminating the temperature difference that forms because of buoyancy in furnace chamber inside, need hot blast be sprayed in the stove with very high height, in this mode, there is situation about can not tackle.

Summary of the invention

The purpose of this invention is to provide a kind of continuous fritting furnace, solve the problem in above-mentioned original technology, even also can will be discharged to outside the stove apace in the high temperature territory more than 1000 ℃, and outside stove, not need a lot of spaces and auxiliary device from the pernicious gas that is sintered the product generation.

For addressing the above problem the continuous fritting furnace of developing of the present invention, it is characterized in that, when the madial wall that conveying is sintered the furnace chamber of product disposes a plurality of gases and sprays into nozzle, spray into the inside, furnace wall in the outside of nozzle at each gas, buried the gas preheating chamber that is provided with heater underground along the stream that sprays into gas.Have again, it is desirable to the gas preheating chamber and serve as reasons and constitute the double-deck porcelain pipe of the stream spray into gas and be disposed at the structure that its inner coiled type heater is constituted, and the outer setting that it is desirable to become in the furnace wall is used for the structure of gas at the collector of the stream uniform distribution that respectively sprays into nozzle.

Continuous fritting furnace of the present invention innerly in the furnace wall has been buried the gas preheating chamber that is provided with heater underground along the stream that sprays into gas, and the gas that sprays into of preheating sprays into nozzle from the gas in the madial wall configuration of furnace chamber and directly sprays in the furnace chamber.Therefore, even in the high temperature territory more than 1000 ℃, also can will be discharged to outside the stove apace from the pernicious gas that is sintered the product generation.And, because the gas preheating chamber is embedded in inside, furnace wall, thus do not need additional space, and be provided with owing to the gas preheating chamber sprays on the nozzle at each gas, spray into so when the adjustments of gas amount, also can will spray into gas equably, also can make gas temperature also even from each discharge nozzle.Have again, spray into the effect that gas has cooled furnace wall, and carry out heat exchange, so can reduce heat loss in inside, furnace wall.

Description of drawings

Fig. 1 is the cutaway view of expression embodiment of the present invention.

Fig. 2 is the side view that expression gas sprays into the configuration of nozzle.

Fig. 3 is the cutaway view of gas preheating chamber.

Fig. 4 is the cutaway view of the other direction of gas preheating chamber.

Fig. 5 is the outside drawing of expression heater shape.

Among the figure:

The 1-furnace chamber, the 2-platen, the 3-madial wall, 4-gas sprays into nozzle, 5-gas preheating chamber, 6-furnace wall, 7-outside porcelain pipe, the inboard porcelain pipe of 8-, 9-heater, 10-collector, 11-electrode, 12-exhaust outlet.

The specific embodiment

Fig. 1 is the cutaway view that expression is applicable to the present invention the embodiment of platen pusher type furnace.Mark 1 is a furnace chamber, is sintered the state that product W piles up with the predetermined distance multilayer on platen 2, by omitting illustrated known conveying mechanism, with the paper vertical direction on carry off and on.Disposing a plurality of gases and spraying into nozzle 4 from being sintered left and right sides madial wall 3 that product W produces the temperature field of pernicious gas.In this embodiment, the product W of being sintered is an electronic unit, and gas sprays into nozzle 4 and is disposed at high temperature territory more than 1000 ℃.

Three gases of each side have been shown among Fig. 1 have sprayed into nozzle 4.But, in this embodiment, pile up 9 layers, so for the medium height position to the product that the are sintered W of each layer sprays into gas, gas sprays into nozzle 4 and staggers small position as shown in Figure 2 on the furnace length direction and dispose 8 in each side owing to be sintered product W.In this embodiment, spraying into gas is nitrogen, but according to kind that is sintered product W and furnace inner environment gas, also can use air and other arbitrary gas.

Spray into nozzle 4 corresponding to each gas, be provided with gas preheating chamber 5.Each gas preheating chamber 5 is embedded in the inside, furnace wall that gas sprays into nozzle 4 outsides, so gas sprays into nozzle 4 and gas preheating chamber 5 is communicated with.Gas preheating chamber 5 is such as shown in Figure 3, Figure 4, the inside in the 6 inner holes that form is set to the double-deck stream that sprays into gas that also forms with outside porcelain pipe 7 and inboard porcelain pipe 8 in the furnace wall, the heater 9 of coiled type is set in the mode of inboard porcelain pipe 8 peripheries of reeling simultaneously.That is the function that has as the supporter of coiled type heater 9 of this inboard porcelain pipe 8.

As shown in Figure 1,6 outer setting is used for to the stream that respectively the sprays into gas collector 10 of distribution of gas equably in the furnace wall, spray into gas in gas preheating chamber 5 inside through the stream that forms by outside porcelain pipe 7 and inboard porcelain pipe 8 time by heater 9 rapidly pre-warmings, and spray into nozzle 4 from gas and be injected to furnace chamber 1 inside.Preheat temperature it is desirable to stove in temperature equal more than 1000 ℃.It is 1～10m/ degree of second that its speed it is desirable to, and sprays into gas flow 4～5m in this embodiment ³/ hr.

Have, it is desirable to, the resistance value of heater 9 does not change with the variation of temperature and time, so caloric value is also constant, in this embodiment, uses the metal heater of Fe-Cr-Al.Here employed heater 9 is the shapes that two coils side by side connected at the top as shown in Figure 5, and is the structure at the center configuration electrode 11 of each coil.So as shown in Figure 2, it is paired to make two gases spray into nozzle 4, each coil configuration sprays in the gas preheating chamber 5 of nozzle 4 at each gas.

So the continuous fritting furnace of the present invention that constitutes is, will be sintered product W multilayer on platen 2 and pile up, and the continuous fritting furnace that when carry off and on the inside of furnace chamber 1, carries out heat-agglomerating along the temperature curve of stipulating.On the position that is sintered product W arrival reaction temperature (for example 1100 ℃) and pernicious gas generation, the nitrogen of preheating sprays into nozzle 4 from a plurality of gases in left and right sides madial wall 3 configuration and sprays into the gap of the product that the are sintered W that piles up to multilayer at a high speed, and the gas of generation is discharged to outside the stove from the exhaust outlet 12 of ceiling bottom.Therefore, can prevent from the decline of the caused sintering quality of gas that is sintered product W generation.

From each gas spray into gas that nozzle 4 sprays into be by the gas preheating chamber of burying underground in inside, furnace wall 5 be heated to stove in the temperature gas of uniform temp substantially.That is, the gas that distributes from the collector 10 of 6 outer setting in the furnace wall in gas preheating chamber 5 inside through the internal flow path that forms by outside porcelain pipe 7 and inboard porcelain pipe 8 time by heater 9 rapidly pre-warmings, and spray into nozzle 4 from gas and be injected to furnace chamber 1 inside.Owing to adopt this class formation, even also can will be discharged to outside the stove fast from the pernicious gas that is sintered the product generation in the high temperature territory more than 1000 ℃.

In the present invention, gas preheating chamber 5 is embedded in inside, furnace wall.Therefore, externally do not need additional space and auxiliary device, and gas preheating chamber 5 can be contained in the inside, furnace wall of common body of heater institute required thickness.In addition, owing on each gas sprays into each of nozzle 4 gas preheating chamber 5 is set, spray into gas equably so can spray into nozzle 4 from each gas under the situation of adjustments of gas amount, also gas temperature also becomes even.Have again, have the effect of cooled furnace wall by heat exchange, rise so can suppress the temperature of furnace wall lateral surface, and can reduce heat loss owing to spray into gas.Have, the present invention does not limit the platen pusher type furnace again, can be suitable in various forms of continuous ovens certainly yet.

Claims

1. a continuous fritting furnace is characterized in that,

When the madial wall that conveying is sintered the furnace chamber of product disposes a plurality of gases and sprays into nozzle, spray into the inside, furnace wall in the outside of nozzle at each gas, buried the gas preheating chamber that is provided with heater underground along the stream that sprays into gas.

2. continuous fritting furnace according to claim 1 is characterized in that:

The gas preheating chamber is made of double-deck porcelain pipe that constitutes the stream that sprays into gas and the coiled type heater that is disposed at double-deck porcelain pipe inside.

3. continuous fritting furnace according to claim 1 is characterized in that:

Outside in the furnace wall is provided for the collector with gas uniform distribution in the stream that respectively sprays into nozzle.